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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d90f8aa82ca5ba18c9608d2742b6400147b1a4bcee66e0abda390419adab998' 
  AND token = 'NJzSy3q5z/mlDA8ngSb8XX5mkMHh8lfXoKf6BWBb/rM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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