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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f2d3ecf5c3e2b0e9fa32666a6accd3288de16923ec8cdde9c4b36d31e22ce6e' 
  AND token = 'ZLR6hxhJvrvzqVIw5gQN1eQXQnfWILvT6ZXiiG+MqoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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