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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01657592ab7e039df86c803b9c53ee041eb5a9f1839e9dfd8c9d094cf9349555' 
  AND token = 'kASSynyUupJJnDEpjnKeoKhaWGrxrOTG+FE2VPeu8co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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