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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6662a823ef61948e82f3003b482e2ff2c117e5a7df75c894b5e7f00800437780' 
  AND token = '9K5Onmg0kC7uzXbDJf5ED9/vg+70fU9EpqrvZxUFhb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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