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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9838eef660709008f124e282c71fbc58494677ed19d1c7db0ec759019624c4a8' 
  AND token = 'lwCeGDJ9Oo6kMBz8K+s7XULlSxl8Uv5EhwFSxLI6MM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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