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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3783f1d2d2ed04eef80a6731f723100c9ad30de9692d9932790ce710ece243ac' 
  AND token = '5f1zVaDkeMLzOHUztcOQJ2EQe1q7U/f0B037k6L4GQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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