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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9448fe6250a42f19fa9741a19733d023c67abc69403be889488641641748da8d' 
  AND token = 'vhwXwtYanT9/F0El7X/r6bHEsQXKBot2cAM8CCrsooc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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