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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4db03b250e4584e1d1b5dbdff3078b93aeecf5cbd031634c43afe88517230ec8' 
  AND token = 'vMQBKG7fk+w/7q0Yrh7ixdrARV7OXjjAs3YBn13/AsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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