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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7bdfb558a131e47abd63a1daa6ce7d098b0153c5367609a06952d759da24a56' 
  AND token = 'ZIc74sZuPBJLrKK+vNbb2Zlf4XTZ5fZAnromcbBg15g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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