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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd3a3c68e418870ba3a30a173efdb34fc3209f8cbfa9ae03358b0a1e47d717e6' 
  AND token = 'T8Hawngw8e21Te2I1Xm3Ms+OcDhYBK05tpuMg0GSNTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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