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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53cf21a8b3ce88d961180b1e0454cdda648664ba3a7cb94b255df9306346d67b' 
  AND token = 'O0HlqQLWccb3M4xjaBHwrJT6rMgPUWa2QQDF29XBDvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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