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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db13c7252c9cc0a5a42d989165eca0349b640ae18372b8a8fe41d0a8a43c2c30' 
  AND token = '1aiAoMXPLJpWYoOKAC2CuvvmEiJ9VgXbOyWZ48cy2Mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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