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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5748e0aab6f1b657d3372c74243718f2b5961c830eb2ef5d1adfeb7f9fe5ff4' 
  AND token = 'i2SdVvOvZ+1qROr8Q1enrNYHtiE2lRHRhMXuSk00PAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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