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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5bb912c00bae44e642d8bf9466e7d6a7cfbd1d9f3a3c8631942fe926206c40e' 
  AND token = 'XfEo1fQQNXkWFiX5ZE9I0N61d3p0d/b8WBKQYp3xPGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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