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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a69d997312f447690db19af30666be2077623f2eeea336b732d1e096fd7968' 
  AND token = 'UCA/GiaOojdSjQunpDIgFMhzguIy7X2znbyxdRKNf/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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