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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cb7926515647c4b8f759a537d9793048be1d8bc363fc2542d8ead0a70049795' 
  AND token = 'KtiC0Z0ZpKj0hq8iv1GkAjvFeRxhrK39ycQjiH2QQxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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