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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec156c0d13b5129b190d7ea6ee1fe1d367b64a73b44e8d2ff8726f5fa3fef0d3' 
  AND token = 'g4tAYCe9TIw2TPWF2tPJ7OocadOx0THC5psiBowPODs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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