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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54da3539a5186401f07657731283a67a6bd71ccda4a1fa94748ba4ca09522aa5' 
  AND token = 'F4s7+NmDObXEdoWv0yVZvq2JZvw3V21f9W7ch4BSlco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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