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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b467caf11ba43f3cfbf54b3b95e6f0ef1a85dd0f3eff4e46193d5758065c4c7' 
  AND token = '6Y8PLtUcPjMTBMbaIaXOJk3H0LY6bTFTaeqcjDavHhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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