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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16cd33379c67f81338fcf5ace3e8ebeae59a91107efe503a99fb21a1930455e5' 
  AND token = 'KahUYQfotmPd03P5ztZbUrM8S5u22CiYjUDb2b2t6LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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