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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be70ece4cf4876400d24665c67b145784eae989698467ca7a426f30a7eac5df5' 
  AND token = '1ad5apiJkM+sLhTH7yCflun3Ek4ZV3AaoSBU3BlCXKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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