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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5971fab60e2f74a562e54cee0a46a91012cfd4fc27849382f4644a64a61acec' 
  AND token = '8PMsHCkh4aPA8Rc7TdqYN/+u4sabT8C8L3AEPXPtpcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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