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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '778d190877d7a74bc9574b32d97cc2413e2279cf21e324086fe54ad67b34b774' 
  AND token = '6aj9CJthQxf90kq+T5J/eGSVbZFCekyzOUc/5dWgYI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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