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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aa47b4ce90f2798fe9685a333d72d8a8b03644bb3e6e44b0cee1aeacd373881' 
  AND token = 'hWJnF3ZssOFUmdGXKdi1Mi9G4lz4VAd4ZZX6ofMRxHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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