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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20ec4bb38669969f2785d4c92a86a7d9accc4638d0899148e53e94df7b67d02d' 
  AND token = 'dZ7aW9++X3VxoyYHok+9Yb0xr/4E2rMUw6vzx7HfjYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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