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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '329bd3ce66314ebeb99e9119e4c79bd857e265e436eaa4bdab0e113d5c75cebd' 
  AND token = 'JDvUNAfFRJb8fCFSgPxV07EBiWIbHCNLuOKxWeeUiCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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