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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65a9638221c0ebd856bbac11a344c66bfc70ab5fc8e00b6e25ac2be28c11c8c2' 
  AND token = 'ufD0se00ZVkHXbqrVhbs2z6TIIuq2jriiffVAp7TxVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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