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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '688a0bdc999a4abea9df998b27fc9ee3a8facaf97f779c801a5de92b4dc6f66b' 
  AND token = '5uqLyAnAf48XNyT5D5eElswIRaJ0UIIwYgcAh4NQaOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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