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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a44a12565746b4b7001a9428142bcac4b44a410ee72a134669a57c011ba7b263' 
  AND token = 'fOk+8nAPKce88nx2UWhlWxwair18xdcC1pHG09qHrJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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