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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ce9d35c64f21619b42c05270e770a45ebc97c90b90a4c54c150db62517f2ce1' 
  AND token = '82g0FcDUcJ2BDXTKpDZq1lJI1BHduM3iE2r5C6q90EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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