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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0a7d1bdcb571e385ab6beffd9a338a73c085d628a91a86d54f21303e36cf9e4' 
  AND token = 'FY4PR087LV2Hn2kfLclE1P425XHz+eP1FRa/jUZdeWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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