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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00c11aa6147bdf55235e0c1e71b9a78258e8e7ff85be9aecab796c789dab3b19' 
  AND token = 'NFLRp8n7iu2QAhlw7CgUiJkOjaOH5T6xK6garOqQ8cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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