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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e256ec3a487877641838b5c57c4faad61cd1321cc8a27b2ee522db5857ac0971' 
  AND token = 'nKPv4IGVJHOu7W5fPH/KatjjYJW3gk9RXaQ6yiO5SZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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