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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05a7ab37235bf34cd8925cc765f08594e953f8550387acd89ca08b2f26d94b4d' 
  AND token = 'v2hI7qOVvr81eQEU7kkbzqR7J7dcOvsaNyzwRcwwX2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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