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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85f6a6c88726193e6d4ede16bc7735f0f57de37805e5eb833f7b6619b8370969' 
  AND token = 'BKthf2kR7s9bX58rtrnUMJZ6YSQs0rrhABh34ezqZ3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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