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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5c694315f5d8cb087a84c1c255566c0e76bfc06d09687ab0a68c74817574866' 
  AND token = '1hiy9IcoZYlFklMw9iSLu3GGKl5zITYas4jjFpOs5X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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