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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc7a7133fd43b9deb331999f04d2d55e8bb2457eb9e9dcc1d2400825c9eaae57' 
  AND token = 'up8XZhj0g8WZUNNkK86YJ6V3goK+iA3Dni8YXZ6+qho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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