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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8082b8a0f3edcd12e53bd6d754f32321d37e16007d7fdf7d05e07658cf86c07' 
  AND token = '5yQHSqw71rQaauHOLqUfz627mi5pOAjMe/cPS15gy9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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