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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32919b699bea6ec4d08d8b619d74f0e8e3fb233eb1c7d18655140587a3dd1cc6' 
  AND token = 'u3gica8OEu4Dn2QshFj7w52+7HoNbXa9RY8yR9eMK+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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