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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf35c993aea66f3e7e92e81b6a331be0020a0f23998c417812a339e86995c18b' 
  AND token = 'X93r8bpE/1TIcARLAvfBx6k3VCytoVSG9alMbxCfElw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}