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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18d2b34bfce76c1cabb5dedda9d9b24ba088abb6807690240d9c4e1a90872c94' 
  AND token = 'geka5FENW7+VU6dRJrw6WXpOJ+qxEKEcU6sGy+TEeSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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