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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9db617b976a3c02c10197b5f89a651b1875f750f97fa9d1dce0cfacd04873859' 
  AND token = 'eeXnu2Aw3Kb3GEHXg58BxlbaVS4jq97s9VTZCVSxeG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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