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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d0123469016e8bbc17eddfc9cfa3e8f6f54e554c3f93baad5415ae1edbf6057' 
  AND token = 'yZv92CTJgWrq7b/2X/aW5a7XDUHnJtkf2+NNdpPp594=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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