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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79dbf21b2defe5d7e906a97a17201e499a6c8a9c55a420064948b1130e85a85e' 
  AND token = 'AieQwhoVDLn9SwHsGy0MtG3tHM2HxnZRuG4+j57KNz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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