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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf6683f9d30d35593d15b7fd2a7bb367cf2e8c427e83c829f562d1abb5efd65c' 
  AND token = 'Ybgm1zXeKzFgiFmmT/gA3iCky7f5gzsRpQMyGHWm6Mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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