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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3acbf3b64a5233d20b63ccd8000f93b4bfbbde1ccbd77a75c01e8f08332a1ec' 
  AND token = 'kc8ZzMRWGUooc8FM5JVaCNYNdA90VPRmmoxSxO3CV2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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