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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0353ba9152b7261ca09c8abafb1197ae7243a3bf34419dcebb94c8bd2b074b5' 
  AND token = 'kB9dKDn4Olzi2vHVV17PZHCy/i3pXX672QTjcRaDxkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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