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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4090afb5c8b5a3628ff9fff0885de34596a9b71a547b1a9bc8990c1070614c5' 
  AND token = '4vbHkGjMbd/NTGk9ca19L5qbvz7J5+Dd/pgokXygW0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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