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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc27b05a9734c991b5e78b8596c84822a2bfe86df660f6ec94f477492e0517c6' 
  AND token = 'glfTxmWbuv7UzSw0sB8aOXJO8JP7VGLXaB4EELzS9mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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