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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4b275f3767089d6cf152c11174d96701da2b2fd4306aad56a66a0aa796a69c5' 
  AND token = 'SoZP89s37OwEVcT4A/OkDC+fVzICCED5SMkMQTvj7vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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