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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd090b6c81a19561ec2a5f230667c2b5895a662c57b019fdf9d007889d32314d7' 
  AND token = 'jNe3x2sr9fW1OJBGLJaQ6EWN1114IdPuOG//sa1M1U8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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