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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e5bfffc310e1f67b0b34c9684259df98a9b8a7a275c64a2ad8c198b2ebc2985' 
  AND token = 'FYt02F4h6DStHaC07/lcM5+m21xIldI/wGkYAw8ZUWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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