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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61c094bf1e94feadc87f3f9e113ccffa90b6419746abaa704a51fee5a848233f' 
  AND token = 'fYueHZuDquDbaazyQ3lyR3I3ssD+h7S/bT6840XWuSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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