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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4384514331fe9d847e81f29f737b4a7930edb3c52a1e26c0fc64699b4ace803f' 
  AND token = 'J/QExkuaF16WBeF1rKTVYy3xDp44Jx3vOsl5bC2Y+Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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