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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fa0d060d99794b35a4379171bc6ef0aeb9a1c48b64a6da8a7b1a9076ed262f2' 
  AND token = 'lLVlDemM5YVnkABkxD400HNTkhnZmuNTavKGBaq+bHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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