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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b6a03c9988740f3a7a13289050f471c0627f235b6d93bff8e58938272de3670' 
  AND token = 'iW+u4tqwW0j5eyw3wKdT9ln+GbcLP6nFDkb6hDaAIYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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