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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5904798d8682e82da7772a40da7d46adec2cc02b000a5f012e02de4687fc56f' 
  AND token = 'bojMZg7FyDXr8VKihp7UTRCwkAT3CX5zCy7LtALGKFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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