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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c59f18f6dc5a8d9119b320eafffc29ab7154ae79bc976767db756e789e361ccd' 
  AND token = 'dZvw9Z7nl3NZBM77k8tuUBYSSF+4glVedB+vYR8dFRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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