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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d07774ae06c8f411a9b036b16b5a35fa5a697b8627e2220a120f3659338ade' 
  AND token = '0M04aYKo6OCRyYcho0sI8eS/NhHAuRUQvC15V8PBjO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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